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Report: Annual Operations, Monitoring, and Maintenance Report Reed Mine Lower Lake, CA
Source or source contact: https://documents.geotracker.waterboards.ca.gov/esi/uploads/geo_report/9179005324/T10000013796.PDF
Publication Date: 3/28/2023
Document Type: PDF
Author: Terracon
Prepared for: Homestake Mining Company

°C	degrees Celsius
°F	degrees Fahrenheit
µg/L	micrograms per liter
µmhos/cm	micromhos per centimeter
µS/cm	microSiemens per centimeter
Ag	Silver
Al	Aluminum
As	Arsenic
AWQC	Ambient Water Quality Criteria
B	Boron
Ba	Barium
BCR	Biochemical Reactor
Be	Beryllium
BOD	Biochemical Oxygen Demand
CaCO₃	Calcium carbonate
CERCLA	Comprehensive Environmental Response, Compensation, and Liability Act
cfs	cubic feet per second
CHIT	Chitorem®
Cl	Chloride
Co	Cobalt
CO₃	Carbon trioxide
COC	Constituent of Concern
COD	Chemical Oxygen Demand
Cr	Chromium
Cu	Copper
DOC	Dissolved Organic Carbon
EPA	Environmental Protection Agency
F	Fluoride
FBR	Fluidized Bed Reactor
Fe	Iron
ft	feet
gpm	gallons per minute
GW	Groundwater
HCO₃	Bicarbonate
Hg	Mercury
K	Potassium
lbs	pounds
Mg	Magnesium
MG	Million Gallons
Mg(OH)₂	Magnesium hydroxide
mg/L	milligrams per liter
Mn	Manganese
Mo	Molybdenum
mV	millivolts
N	Nitrogen
N/A	not applicable
Na	Sodium
NA	Not available
ND	Not detected
Ni	Nickel
NO₃	Nitrate
NO₃ + NO₂	Nitrate + Nitrite
NR	Not reported
NTU	Nephelometric Turbidity Unit
OH	Hydroxide
OU	Operable Unit
P	Phosphorus
Pb	Lead
PRB	Permeable Reactive Barrier
RA	Remedial Action
RO	Reverse osmosis
SAPS	Successive Alkalinity Producing System
Sb	Antimony
Se	Selenium
SO₄^2-	Sulfate
SRB	Sulfate Reducing Bacteria
STC	Seep Treatment Cell
TDS	Total Dissolved Solids
TOC	Total Organic Carbon
TSS	Total Suspended Solids
U	Uranium
UF	Ultra-filtration
V	Vanadium
VFR	Vertical Flow Reactor
Zn	Zinc

Label	Description
Site Name	Name of the site
EPA CERCLA ID	EPA CERCLA ID number
Parent Name	If the test was conducted at a 'child' site or an alias, this is the name of the larger associated Superfund site.
Operable Unit (OU)	Specific operable unit (OU) of the site if specified
Technology Tested	Name of the technology tested
Technology Type	The technology type (i.e., active or passive/semi-passive)
Source of MIW	Source of the MIW (e.g., adit drainage, groundwater)
Treatment Train? (Y/N)	Whether the treatment was a treatment train (i.e., multiple individual technologies)
Specific Component for Performance Data	Component for which data are reported
Technology Requirements	Requirements of the technology (e.g., electricity, pH > or < X, dissolved oxygen < X, etc.)
Geographic conditions/ constraints	Geographic conditions/constraints (e.g., topography, climate)
Scale	Scale of the technology (e.g., pilot, or full-scale application)
Duration of Study	Length of the study
Constituent	Element or ion treated
Constituent Phase	Identity - contaminants of concern (COCs) and others having data/information on treatment
Unit	Unit of concentration reported in study
Max. Influent Concentration	Maximum influent concentration treated
Associated Effluent Concentration	Effluent concentration attained for maximum concentration treated
Max. Effluent Concentration	Maximum effluent concentration treated
Associated Influent Concentration	Influent concentration attained for maximum concentration treated
Min. Influent Concentration	Minimum influent concentration treated and
Associated Effluent Concentration	Effluent concentration attained for maximum concentration treated
Min. Effluent Concentration	Minimum effluent concentration treated and
Associated Influent Concentration	Influent concentration attained for maximum concentration treated
Avg. Influent Concentration	Average influent concentration treated and associated time
Avg. Associated Time (Influent)	Time over which average X was calculated
Med. Influent Concentration	Median influent concentration treated and associated time
Avg. Associated Time Influent)	Time over which average X was calculated
Avg. Effluent Concentration	Average effluent concentration treated and associated time
Avg. Associated Time (Effluent)	Time over which average X was calculated
Med. Effluent Concentration	Median effluent concentration treated and associated time
Avg. Associated Time (Effluent)	Time over which average X was calculated
Avg. Percent Removal	Average percent removal
Parameters	Parameters associated with the concentrations of other data documented
Loads Treated	Mass of constituent per unit flow
pH	pH associated with documented concentrations
DO	DO associated with documented concentrations
Water Temperature	Water temperature associated with documented concentrations
Air Temperature	Air temperature associated with documented concentrations
ORP	Oxidation-reduction potential associated with documented concentrations
Specific Conductivity	Specific conductivity associated with documented concentrations
Flows treated	Flows treated
Were treatment goals met? (Y/N)	Whether the testing met the treatment goals
Performance Metrics	Goals or performance metrics upon which the treatment success was based
Limitations/Constraints	Any limitations or constraints noted that contributed to success or failure
Longevity Estimates	Estimates of longevity, if provided
Lessons Learned	Any reported lessons learned
Reported Cost Data	Any reported cost data
Other design details	Any other design details provided in the sources cited
Other performance details	Any other performance details provided in the sources cited
Limitations to the found data	Limitations to the data found (e.g., data in the source only presented as averages, so was unable to report maximum influent treated with corresponding effluent attained)
Notes	Any notes

Site Name:	REED MERCURY MINE
EPA CERCLA ID:	CAD982399990
Parent Name (if applicable):	N/A

Operable Unit (OU):	N/A
Sample Site ID:	Vertical Flow Reactor
Site Status:	Data not provided
Technology Tested:	Vertical Flow Reactor (VFR)
Technology Type:	Semi-passive
Technology Name:	Vertical Flow Reactor (VFR)
Pre-treatment or No Pre-treatment:	No pre-treatment
Source of MIW:	Old Lower Reed Adit
Treatment Train? (Y/N):	Y
Specific Component for Performance Data:	VFR component of combined VFR/wetland system
Technology Requirements:	Two-cell vertical flow reactor fed by collector pipe that delivers mine water from adit. Small wetland area receives treated water.
Geographic conditions/constraints:	Central California, regular maintenance to prevent clogging in collector pipe
Scale:	Mine adit with approximately 0.5 gpm discharge
Duration of Study:	2021-2023

Constituent:	Aluminum
Constituent Phase:	Al, dissolved µg/L
Reported as Load (Y/N):	N

Max. Influent/Pre/Upgradient Concentration:	<56.1
Associated Effluent/Post/Downgradient Concentration:	<56.1
% Removal Efficiency (calculated):	Not Applicable

Avg. Influent/Pre/Upgradient Concentration:	Data not provided
Avg. Associated Time (Influent/Pre/Upgradient):	Data not provided

Were treatment goals met? (Y/N):	Unclear
Performance Metrics:	Objective is to "reduce Al, Co, Fe, Mn, Hg, and Ni concentrations so that infiltration of treated water would minimize any water quality impacts in downstream surface water." Results vary by year "The system is functioning as intended and is effective at
Limitations/Constraints:	Quarterly maintenance needed for the system to function as designed. Metals precipitate can clog collection pipe. Some wildlife mortality when amphibians are trapped in VFR
Longevity Estimates:	Data not provided
Lessons Learned:	Data not provided
Reported Cost Data:	Data not provided
Other design details:	Orange hydrous ferric oxide (HFO) precipitate must be removed from the VFR and sent to landfill for disposal
Other performance details:	Sometimes effluent concentrations of Cu, Mn, Ni were higher than influent. VFR did not have a significant effect on Cu, Ni, and Mn. Al and Hg were not consistently detected in effluent. VFR consistently removed Ar and Fe and generally removed Cobalt. Water from the VFR enters the wetland for vegetative uptake. Excess water during the rainy season enters an infiltration trench which minimizes discharge to downstream surface water.
Limitations to data found:	Effluent flow data not collected in 2023. Flow ranges for effluent in Flow Rate column BH do not include 2023 flows. Results for wetland performance were not available.

Were treatment goals met? (Y/N):	Unclear
Performance Metrics:	Objective is to "reduce Al, Co, Fe, Mn, Hg, and Ni concentrations so that infiltration of treated water would minimize any water quality impacts in downstream surface water." Results vary by year "The system is functioning as intended and is effective at
Limitations/Constraints:	Quarterly maintenance needed for the system to function as designed. Metals precipitate can clog collection pipe. Some wildlife mortality when amphibians are trapped in VFR
Longevity Estimates:	Data not provided
Lessons Learned:	Data not provided
Reported Cost Data:	Data not provided
Other design details:	Orange hydrous ferric oxide (HFO) precipitate must be removed from the VFR and sent to landfill for disposal
Other performance details:	Sometimes effluent concentrations of Cu, Mn, Ni were higher than influent. VFR did not have a significant effect on Cu, Ni, and Mn. Al and Hg were not consistently detected in effluent. VFR consistently removed Ar and Fe and generally removed Cobalt. Water from the VFR enters the wetland for vegetative uptake. Excess water during the rainy season enters an infiltration trench which minimizes discharge to downstream surface water. Results for wetland performance were not available.
Limitations to data found:	Effluent flow data not collected in 2023. Flow ranges for effluent in Flow Rate column BH do not include 2023 flows. Results for wetland performance were not available.

Were treatment goals met? (Y/N):	Unclear
Performance Metrics:	Objective is to "reduce Al, Co, Fe, Mn, Hg, and Ni concentrations so that infiltration of treated water would minimize any water quality impacts in downstream surface water." Results vary by year "The system is functioning as intended and is effective at
Limitations/Constraints:	Quarterly maintenance needed for the system to function as designed. Metals precipitate can clog collection pipe. Some wildlife mortality when amphibians are trapped in VFR
Longevity Estimates:	Data not provided
Lessons Learned:	Data not provided
Reported Cost Data:	Data not provided
Other design details:	Orange hydrous ferric oxide (HFO) precipitate must be removed from the VFR and sent to landfill for disposal
Other performance details:	Sometimes effluent concentrations of Cu, Mn, Ni were higher than influent. VFR did not have a significant effect on Cu, Ni, and Mn. Al and Hg were not consistently detected in effluent. VFR consistently removed Ar and Fe and generally removed Cobalt. Water from the VFR enters the wetland for vegetative uptake. Excess water during the rainy season enters an infiltration trench which minimizes discharge to downstream surface water. Results for wetland performance were not available.
Limitations to data found:	Effluent flow data not collected in 2023. Flow ranges for effluent in Flow Rate column BH do not include 2023 flows. Results for wetland performance were not available.

Characterization, Cleanup, and Revitalization of Mining Sites

Treatment Technologies for Mining-Influenced Water Profile

Technology: Vertical Flow Reactor (VFR)